do one's business

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do one's business (third-person singular simple present does one's business, present participle doing one's business, simple past did one's business, past participle done one's business)

1. (idiomatic, euphemistic) To defecate or urinate.
2. (dated) To ruin somebody.
   • 1702, George Farquhar, The Inconstant, or the Way to Win Him:

     I'll spoil his wandering , I'll warrant gouty fellows , that would debar their children him . I'll do his business that way, never fear